Flexfit design for multipurpose use Windproof microbacterial technical fabric used to generate a form-fitting design with Lycra panels on the sides gives you all the movement you need Designed to be powered with a 12V battery; you can connect it to a motorcycle, snowmobile, ATV or scooter to receive continuous heat Comes with two front side pockets and a 20" battery cord Snap-on electric connection on back of the vest for connecting gloves by using the snap ON/OFF glove harness (PART #2130-0079), sold separately Two input connections allowing the temperature of the gloves and vest to be controlled independently Vest produces 53 watts of heat and draws 3.9 amps of current (tested while engine is idling) On/off and temperature control for the jacket liner requires the purchase of either the coax switch cord (PART #2130-0073) or single output temperature controller (PART #2130-0070); for use with gloves, purchase either the dual coax switch cord (PART #2130-0080) or dual temperature controller (PART #2130-0071), sold separately GEN X-3 and GEN X-4 are fully compatible.. VEST LINER HEAT X4 BK XL